# Number line

In mathematics **lessons, a number line** is understood to mean the visualization of real numbers as points on a straight line .

In the picture, the locations of the points of the whole numbers are highlighted by vertical lines.

The number line is an illustration of the one-dimensional Euclidean vector space . The illustration shows that the set of real numbers forms a linear order by means of the usual comparisons . The number line continues in both directions to infinity. The arrow on the right side of the graph indicates that the numbers will increase in that direction.

In class, a **number line is** used to illustrate the natural numbers .

The following figure shows the location of some special real numbers: the square root of 2, Euler's number, and the circle number .

## See also

## Web links

**Wikibooks: Math for non-freaks: number line**- learning and teaching materials

- Numbers and the number line - an animation (Flash plugin required)